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Fix ShortSignature.fromHex to check the G1 point is valid

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This commit is contained in:
Jack Lloyd 2023-08-31 13:28:53 -04:00
parent ccea23a712
commit 156a1e909a
1 changed files with 3 additions and 1 deletions
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4
src/bls12-381.ts
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@ -1188,7 +1188,9 @@ export const bls12_381: CurveFn<Fp, Fp2, Fp6, Fp12> = bls({
if (!y) throw new Error('Invalid compressed G1 point');
const aflag = bitGet(compressedValue, C_BIT_POS);
if ((y * _2n) / P !== aflag) y = Fp.neg(y);
return bls12_381.G1.ProjectivePoint.fromAffine({ x, y });
const point = bls12_381.G1.ProjectivePoint.fromAffine({ x, y });
point.assertValidity();
return point;
},
toRawBytes(point: ProjPointType<Fp>) {
return signatureG1ToRawBytes(point);